Dtc U1140: Lost Communication With Bcm (Reception Error) - Suzuki Swift Sport 2004 Service & Repair Manual

4F-52 Electronic Stability Program:
Step
3 Check each control module connectors
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Check DTC for ESP®.
Is DTC U1126 detected?
4 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of ESP® control module, BCM
and steering angle sensor communicating by means of
CAN.
3) Check CAN communication circuit for open, short and
high resistance.
• Between ESP® control module and BCM
• Between steering angle sensor and BCM
Is each CAN communication circuit in good condition?
5 CAN communication circuit check
1) Disconnect connectors of all control modules
communicating by means of CAN.
2) Check CAN communication circuit between control
modules other than Step 4 for open, short and high
resistance.
Is each CAN communication circuit in good condition?
6 DTC check for ESP®
1) Connect connectors of disconnected control modules
communicating by means of CAN.
2) Disconnect each connector.
• ECM
• Keyless start control module
• Combination meter
• Steering angle sensor
• BCM
3) Check DTC for ESP®.
Is DTC U1126 detected?

DTC U1140: Lost Communication with BCM (Reception Error)

Wiring Diagram
Refer to "Wiring Diagram" under "DTC U1073: Control Module Communication Bus Off".
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
BCM message data is missing from CAN communication. • CAN communication circuit
Action Yes
Go to Step 4.
Repair or replace the
CAN communication
line.
Go to Step 6.
Check ESP® control
module power and
ground circuit. If circuits
are OK, substitute a
known-good ESP®
hydraulic unit / control
module assembly and
recheck.
Trouble Area
• BCM
• ESP® control module
No
Check for intermittent
trouble referring to
"Intermittent and Poor
Connection Inspection
in Section 00".
Go to Step 5.
Repair or replace the
CAN communication
line.
Check applicable
control module power
and ground circuit. If
circuit is OK, substitute
a known-good
applicable control
module and recheck.
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